Fire-box for boilers



(No Model.)

T. POORE. FIRE BOX FOR BOILERS.

510.335,?15. V Patented'Feb. 9, 1886.

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UNITED STATES PATENT OFFICE,

TOlVNSEND POORE, OF SGRANTON, PENNSYLVANIA.

FIRE-BOX FOR BOILERS.

5PECIPICATION forming part of Letters Patent lN'o. 335,715, datedFebruary 9, 1886.

Application filed April 15, 1885.

To aZZ whom it may concern.-

Be it known that I, TOWNSEND PooRE, a citizen of the United States,residing at Scranton, in the county of Lackawanna and State ofPennsylvania, have invented a new and useful Improvement in CombinedFire-Box and Endless-Chain Grate for Boiler and other Furnaces, of whichthe following is a specifb cation.

My invention consists, first, in a'fire-box having a feed archway orchannel beneath the boilers extending from side to side of thefurnace-wall in rear of the ash-pit chamber and in communicationtherewith; second, in an endless grate supported at its feed end in saidarchway or channel, passed through the ash-pit chamber, and suitablysupported and driven at its discharging end near the front of the saidchamber; third, in an endless-chain grate constructed and arranged tomove in a direction toward the front of the fire-box; and, fourth, inthe combination of the several parts, as will be hereinafter describedand claimed.

My invention is designed especially for burning culm or anthracite dust,and it is found that this object can be more effectually accomplished byfeeding the fuel upon the grate at the rear of the ash-pit chamber andmoving it toward the front of the same in a direction the reverse of thedraft of the furnace-and when the grate is thus arranged the archwayaffords great convenience for the dumping of the fuel in the properposition for handling when the fires require .replenishment, While byhaving the ashes discharged at the front of the fire-box into a chuteevery facility for ready handling and removal by barrows or carts issecured.

In the drawings, Figure 1 is a longitudinal section of a boiler andfurnace or fire-box with my invention; Fig. 2, a vertical cross-sectionof the same, and Fig. 3 a front View.

A is a boiler-furnace comprising a steamboiler, B, a fire-chamber, C,and an ash-pit, D. The products of combustion under this constructionwill pass from the fire-chamber beneath the boiler to the rear of theboiler or boilers and be drawn through a return flue or fines, B, of theboiler or boilers to the front of the furnace by the draft of the stackor chimney A, which is at the front of the fur Serial No. 102,220. (NomodelJ nace, and all communication with the stack or chimney cut offduring the general operation of the furnace, except through the flue orflues of the boiler or boilers.

The'fire-bridge wall a is formed with a passage, b, of a width andheight suitable for the travel through it of an endless-chain grate, E,and in rear of this fire-bridge wall an archway or channel, F, isconstructed extending from side to side of furnace-wall and affordingentrance back of the bridge-wall a on either side of the furnace; Thetop or upper exposed portion of this archway is formed of fire-brick andunited with the furnace-foundation and the fire-bridge wall in themanner shown, or in any other suitable manner, and is strengthened andsustained by iron girders c, or otherwise properly, as shown.

At the front of the ash-pit chamber a brick extension is made forsupporting the shafts of the endless-chain grate, and for forming anash-chute, G, and in the front wall of the ashpit chamber an opening, d,of a width and height suitable for the travel of the endlesschaiu grateE is formed, as shown, and pendent from the wall of the archway and Wallof the ash-chute are two pivoted self opening and closing doors orplates, 6 f, as shown. The grate B may be a single broad-surfacedendless chain, or it may be composed of a series of endless chainsmoving independently of one another and together, as may be found mostdesirable. This endless-chain grate, if a single chain, is supported atits feeding end by a plain drum, H, and at its discharging end by adriving-spider, I, and the shaft of this spider may be extended enoughbeyond the end of the spider and the outer side of the ash-chute toreceive a Oltllkdlitlldl for revolving the spider, and thereby movingtheendless chain in the direction of the arrow.

The links of the chain may be provided with ribs 011 their uppersurfaces, and also suitably notched or shaped on their under surfaces toinsure the wings of the spider taking a firm hold upon them and causingthe chain to move, as set forth in my application No. 162,319, filedApril 15, 1885, now pending before the United States Patent Office. Ifthe grate is formed of several endless chains, so as to movelongitudinally independently of one another, and together, when desi red,the spider and plain drum will be made in sections and provided withtoothed wheels 9, and into the wheels 9 sliding shifting pinions h on asquare or other suitable shaped shaft, J, provided with crankhandles,will gear, so as to move either all of the sections together, or any oneor any number of them, as circumstances may require, in the same manneras set forth in my aforesaid pending application No. 162,319, filedApril 15, 1 885. In either form of the endless grate that portion whichsupports the fuel will rest upon either rollers 13, as shown, or upon1ongitudinal fiat-surfaced bars, applied and sus tained by cross-girderslet into the furnacewalls, as set forth in my aforesaid pendingapplication. Beneath the upper part of the endless chain aplatform orscreen, K, supported by crOssgirders, is applied, so that ashes and livecoals may be caught and pre- .above the platform K, in the side of thefurnace, doors are provided for admission of air and also implements forcleaning ashes from the platform. The pivoted doors or plates 6 f servefor keeping closed the spaces provided above the grate as the grate withignited fuel upon it travels in the direction of the arrow. The draft ofthe furnace is directly opposite to that indicated by the arrow, andhence the new or fresh fuel passing in the direction of the arrow issubjected to the flame drawn by the draft from a bed of red-hot fuelforward of the new or fresh fuel, and a very rapid ignition of the newfuel is insured, and this result is increased by setting the grate sothat the fuel will be moved on an upward-m cline plane,as shown. Thefuel to be supplied to the furnace is dumped into the archway-of thefurnace and supplied upon the rearend of the grate, and as the grate isslowly revolved by the spider and additional fuel fed upon it the fuelfirst fed upon the grate is carried along chute, and simultaneouslytherewith fuel is fed upon the grate as in the first instance until aproper quantity of the spent products is discharged and of new fuel issupplied. By this mode the fires are kept going Without raking, anoperation which tends to deaden and put out culm fires, and ifnecessarythe side draftdoors are opened to any extent desired for theadmission of air, and at periods these doors are opened and implementsare inserted for the purpose of removing ashes and other matters fromthe platform or screen.

While I have set forth that I contemplate using a series of endlesschains forming a grate and moving separately and together, I do notclaim under this application such series of endless chains forming agrate and moved separately and together, as that is claimed under mypending application, No. 162,319, filed April '15, 1885; nor do I intendto claim under this application anything claimed in said application.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. A furnace provided with a feed archway or channel beneath the boilersfrom side to side of the furnace-wall, in rear of the ash-pit chamberand in communication with said chamber, substantially as described.

2. An endless-chain grate supported at its feed end in a feed archway orchannel, passed through the ash-pit chamber, and supported and drivenatits discharging end near the front of.said chamber, substantially asdescribed.

3. The combination, with a fire-box having a feed-archway in rear of itsash-pitchamber, of an endless-chain grate moving toward the front of thefire-box,an ash platform and screen, K, and side doors, I I, foradmission of draft and cleaning implements, substantially as described.

4. The combination of the endless chain grate moving against the draftof the fire-box, the fire-chamber provided with the pivoted doors orplates e f, and the feed archway or channel, substantially as described.

TO\VN SEND POORE.

Witnesses:

JQHN F. SNYDER, HENRY JIFKINs.

